Diff: features/unsupported/tests/mbed/div/main.cpp

Revision:

0:f269e3021894

diff -r 000000000000 -r f269e3021894 features/unsupported/tests/mbed/div/main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/features/unsupported/tests/mbed/div/main.cpp	Sun Oct 23 15:10:02 2016 +0000
@@ -0,0 +1,44 @@
+#include <utility>      // std::pair
+#include "mbed.h"
+#include "test_env.h"
+
+uint32_t test_64(uint64_t ticks) {
+    ticks >>= 3; // divide by 8
+    if (ticks > 0xFFFFFFFF) {
+        ticks /= 3;
+    } else {
+        ticks = (ticks * 0x55555556) >> 32; // divide by 3
+    }
+    return (uint32_t)(0xFFFFFFFF & ticks);
+}
+
+const char *result_str(bool result) {
+    return result ? "[OK]" : "[FAIL]";
+}
+
+int main() {
+    MBED_HOSTTEST_TIMEOUT(20);
+    MBED_HOSTTEST_SELECT(default_auto);
+    MBED_HOSTTEST_DESCRIPTION(Integer constant division);
+    MBED_HOSTTEST_START("MBED_26");
+
+    bool result = true;
+
+    {   // 0xFFFFFFFF *  8 =  0x7fffffff8
+        std::pair<uint32_t, uint64_t> values = std::make_pair(0x55555555, 0x7FFFFFFF8);
+        uint32_t test_ret = test_64(values.second);
+        bool test_res = values.first == test_ret;
+        result = result && test_res;
+        printf("64bit: 0x7FFFFFFF8: expected 0x%lX got 0x%lX ... %s\r\n", values.first, test_ret, result_str(test_res));
+    }
+
+    {   // 0xFFFFFFFF * 24 = 0x17ffffffe8
+        std::pair<uint32_t, uint64_t> values = std::make_pair(0xFFFFFFFF, 0x17FFFFFFE8);
+        uint32_t test_ret = test_64(values.second);
+        bool test_res = values.first == test_ret;
+        result = result && test_res;
+        printf("64bit: 0x17FFFFFFE8: expected 0x%lX got 0x%lX ... %s\r\n", values.first, test_ret, result_str(test_res));
+    }
+
+    MBED_HOSTTEST_RESULT(result);
+}